[[https://gerrit.wikimedia.org/r/c/mediawiki/core/+/635875/4/maintenance/tables.sql|iw_url has been blob datatype since 2007]] but in production it's varbinary(127):
```
wikiadmin@10.64.32.77(enwiki)> desc interwiki;
+-----------+----------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+----------------+------+-----+---------+-------+
| iw_prefix | varbinary(32) | NO | PRI | NULL | |
| iw_url | varbinary(127) | NO | | NULL | |
| iw_local | tinyint(1) | NO | | 0 | |
| iw_trans | tinyint(1) | NO | | 0 | |
| iw_api | blob | NO | | NULL | |
| iw_wikiid | varbinary(64) | NO | | NULL | |
+-----------+----------------+------+-----+---------+-------+
6 rows in set (0.00 sec)
```
This will cause issues if the url for the interwiki is more than 127 characters.
```
ALTER TABLE /*_*/interwiki
MODIFY iw_url BLOB NOT NULL;
```
Where: s1,s2,s3,s4,s6,s7 (we still need to check which wikis (if not all))